3. Protein Targeting and Degradation

Posttranslational Modification of Many Eukaryotic Proteins Begins in the Endoplasmic Reticulum

Glycosylation Plays a Key Role in Protein Targeting

Signal Sequences for Nuclear Transport Are Not Cleaved

Bacteria Also Use Signal Sequences for Protein Targeting

Cells Import Proteins by Receptor-Mediated Endocytosis

Protein Degradation Is Mediated by Specialized Systems in All Cells